phenformin
noun
phen·for·min
fen-ˈfȯr-mən 
: a biguanide C10H15N5 formerly used to treat diabetes but now withdrawn from use because of its link to life-threatening lactic acidosis
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“Phenformin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/phenformin. Accessed 18 Apr. 2024.
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